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Data Sources
- Megan Ellis
frevvo allows you to generate forms automatically based on one or more pre-existing XML schemas. This enables you to quickly create forms that align with your databases, web services, BPM system, and key business applications.
For practical examples of this approach please refer to Creating a Form Connected to your Database.
In general, frevvo can be created via two different methods:
- By dragging Palette Controls onto the form canvas
- By adding controls from a data source
It's very common and easy to create your form by dragging and dropping controls from frevvo's control palette to the form canvas. As you do this frevvo automatically creates an XSD description of your form's controls. You can download this XSD from the Forms and Workflows Home Page. This method is typically used when your forms do not need to integrate with a back end system.
You can mix and match these two approaches of form creation. You can create all the controls in your form from XML schema elements. You can create all the controls in your form from the frevvo palette. Or you can create part of the form from schema elements and part from palette controls that have no relation to the elements in your schema.
Basic Concepts
When users submit a form that was created wholly or in part from schemas, you will see in the Submissions repository one XML instance document for each global schema element. You also will see one XML document for the form itself, which references any controls you dragged in from the palette. All XML documents are automatically validated against their schemas.
When you upload a schema to frevvo, you can use any and all global elements in the schema. If you want items from the schema that are not global elements, edit the schema and make the items global elements before uploading the schema to frevvo.
At a high level, when you work with schemas you do the following:
- Upload your schema to one of your frevvo projects
- Choose the global elements you want and add them to your form’s Data Sources
- Generate form controls from the global elements you added
- Modify the controls (if necessary) to suit your form
These steps are discussed in detail below.
Form Schema
frevvo automatically generates an XSD schema representation of your form as you drop controls from the frevvo palette to the form designer canvas. You can download this XSD by selecting
Download Schema from the 
Action Menu on the Forms and Workflow Homepage. The XSD elements are named after the control names. The types are based on which control you selected from the palette. For example a Quantity control will appear as an xsd:integer. A dropdown will be an xsd:simpleType restriction. Controls with patterns such as the Zip will have an auto-generated type with your pattern. Click "expand Source" for an example.
Generating an XML Schema
First, you need to generate an xml schema that will be uploaded to frevvo. See the chapter Creating a Form Connected to your Database for instructions on generating a schema using the frevvo Database Connector.
Using Your Schema
Before you can use global elements from a schema in a form, you must upload the schema XSD file into one of your frevvo projects. To upload a schema:
- From the Projects page, click the name of the project with the forms that will use the schema.
- Click Schemas from the left-hand menu.
- From the Schemas page, click the
Add icon.
- On the Upload Schema Page, type a meaningful name for your schema and provide a description. (These are optional but highly recommended.) The Name and Description are each limited to 255 characters.
- Click Browse, locate the schema XSD file or zipfile with multiple related XSDs on disk.
- If there are multiple global elements in the zipfile(s) specify exact name (relative to the top level directory separated by the '/' character of the XSD file containing the root schema.
- Click Upload.
If your schema is valid, its name now will appear on the Schemas page. You can
sort the Schemas list alphabetically (A-Z or Z-A). If you tried to upload an invalid schema, frevvo will not allow the upload and display an error message.
Important notes about uploading schemas:
- You may add as many schemas as you require; however, you cannot have two or more data sources in your project with the same root element name.
- You may use global elements from uploaded schemas in any and all forms in the project.
- If you want to use the same schema elements in multiple projects, upload the schema to each project separately.
- If your schema references another schema, you must upload all related schemas in a single zipfile.
- If you upload a zipfile all the schemas in the zipfile must be related.
- If you have unrelated schemas you must upload them individually or alone in their own zipfile.
If you add a data source (XSD) to your form/workflow that has the root element name "form" that frevvo uses by default for the palette control XSD, you will see an application error. To resolve, edit the form or workflow "Element Name" property and change it from the default "form" to whatever you want to call it.
Adding Elements to a Form’s Data Sources
Once you’ve uploaded your schema, the next step is to choose the global elements you want for a particular form. The elements you choose will be displayed in the form’s Data Sources area on the lower left portion of the Forms Designer. You may add the elements to as many forms as you wish, but you must work with one form at a time.
To add the elements to a form’s Data Sources:
- Open the form in the Forms Designer (by clicking the form name from the Form and Workflows Homepage).
- In the Data Sources area on the left side of the Forms Designer, click New from XSD
icon. - You’ll see all available schemas; click the plus sign
to expand the schema folders and display the global elements from each. - Click the
icon next to each global element you want. If the element is a complex type, you will see the parent element only, but the child elements will be added automatically to your form’s Data Sources. You may add as many elements as you like.
After you close the page, you’ll see in the Data Sources area each element you chose. (We added the Address Book and Policy Information global elements in this example.) For each element you added to your form’s Data Sources, frevvo will generate an XML instance document that you will see in the Submissions repository each time users submit your form, even if you do not end up generating a control from the element. Therefore, if you add an element to your form but later determine you don’t need to generate a control from it, make sure to delete the element from the form’s Data Sources.
Adding multiple data sources from the same namespace will cause a clash in your form. And in fact, frevvo will assist you by preventing you from making this mistake. A warning message is displayed in the Add Data Source panel when you click plus.
Similarly, multiple XSD files composing a single logical namespace is not supported. Instead, merge all XSD files for the same namespace into a single XSD file and then upload into frevvo.
Generating Controls from Schema Elements
Once the global elements are part of your form’s Data Sources you can generate controls for any or all of them.
To generate a group control that automatically includes controls for all of a parent element’s children, click the icon to the right of the parent. The controls for the children elements will be inside a section control. If the complex type has repeating items, the section will be inside a repeat control.
To create individual controls for specific children of a complex type, click the + icon to expand the group and click the icon next to each desired child element. In the above example we could generate controls for First Name and Last Name but not for the phone number or email address.
You do not drag the elements from the Data Source tab into your form; instead when you click the icon the generated controls are automatically added to your form.
The controls are added above the currently selected control. The only exception is if the control is part of a repeating group and the currently selected control is not one in that group. frevvo must add controls in a repeating group to the same location on the form as the others from that same group. So it will ignore your selection.
You can then place the controls where you want by following the normal drag and drop rules, with one additional restriction: you cannot drag any control into or out of a repeat control generated from a schema element. (If you need to do this, you will have to edit the schema.) Rearranging the controls will not affect the structure of the form’s XML submission documents or how submission data is captured.
When a from palette form's XSD is imported as a Data Source into a new form, tab controls are lost .
Data and Display Types
Most controls generated from schema elements will appear initially as text controls. For example an xsd:integer type will appear as a text input control. However all validation for the controls will be based on the schema datatype. For example an xsd:integer type will only allow numeric values.
Schema elements that specify element restrictions will automatically be displayed as selection controls. It will display as a dropdown if there are four or more valid choices and a radio button if there are fewer than four valid values. You can change the display type between radio and dropdown and checkbox using the DisplayAs property.
Xsd:boolean types will automatically be displayed as a boolean checkbox. If checked, the value will be 'true' and if unchecked it will be 'false' if the element is required and no value if optional. You can set the label of the true and false options via the Labels property. However, only the 1st option which maps to the 'true' choice will be displayed. If you add more then 2 labels the extra labels will be auto removed. If you set only a single label a 2d label of 'false' will be auto-added for you.
Show Controls from Data Source
To locate the controls on the designer canvas that come from one of the data sources added to the form, click the 
icon. This will highlight the associated controls.
Modifying Controls Generated from Schema Elements
The schema you retrieve from your database will be relatively generic. As a result the controls you generate from this database schema might need some tweaking to suit the specific needs of your form. You can modify a control’s behavior by making changes to the schema after you have retrieved it. There are two ways to modify controls that you generated from schema elements. You can:
- Make changes to the controls in the Forms Designer
- Make changes to the schema, and then update the schema in frevvo by uploading the revised schema
Changes You Can Make in the Forms Designer
For controls generated from schema elements, you can make some but not all of the changes that you can for controls you drag in from the palette. Here are the changes you can make in the Forms Designer:
- Change the control Name — although this does not change the underlying XSD element name.
- Create rules that rely on the controls.
- Set default value for the controls.
- Rearrange the location of controls in your form. This includes moving sections into tabs or panels. As noted above, in addition to the normal drag and drop restrictions, you may not drag any control into or out of a repeat control generated from a schema element.
- Modify the control’s DisplayAs property to change how the control looks on the form. The DisplayAs property appears only for controls created from schema elements and appears instead of the Control Type property that you see for controls you have dragged in from the palette.
- Change the control’s label. You’ll see the new label name in the Submissions Repository Data Tab and in Excel if you download the submission results. However, the Submissions XML document for the schema will reflect the original element name.
Note that you cannot change a control’s validation behavior in the Forms Designer as you can for controls you drag in from the palette. You must do this by changing the schema. This is discussed below.
In general, the Forms Designer prevents you from making changes that will violate the integrity of the schema and cause issues when users submit your form. One exception is if you inadvertently generate two controls from the same element—in this case, users would see two controls on the form and could submit two different values, but the Submissions XML document would not be able to capture both values since the element exists only once in the schema.
You also must be careful when deleting elements from the Data Sources area, especially if you have previously created controls from these elements. This is discussed in detail below.
Changes You Cannot Make in the Forms Designer
One of the most important differences between controls generated from schema elements and controls you drag in from the palette is validation behavior. You’ll notice for example that you can’t check or uncheck the control’s Required checkbox in the Form Designer Properties area, nor can you access the control’s Pattern property.
Validation for controls you generate from schema elements is based on the element’s XSD type and other schema-specific information, such as whether the control is required based on the minOccurs value. If you generate a control from an element that is an integer and another from an element that is a string, the two controls initially will be generated as text controls but the first control will require users to enter integers and the second control will not.
You can see an element’s XSD type by clicking the control in your form and hovering over the Properties area of the Forms Designer--the XSD type and the global element to which it is bound will be displayed as a tooltip. See DisplayAs below. The only way to change the validation for a control generated from a schema element is to revise the schema and update the schema in frevvo with the new version. The same is true for other changes you wish to make that you cannot accomplish in the Forms Designer.
You also cannot change the number of repeat items on the form. This is because the number is dictated by the minOccur in the schema. If minOccur=2 then there will by default be two repeat items displayed in the form designer, for example. Thus if you click the displayed in the form designer on a repeat from schema, it will display a message indicating that this operation is not permitted. To change the number of items on the form, edit the schema and change minOccurs.
Adding Dropdown/Radio Options
Suppose you want users to select a specific manager’s name from a dropdown list. Your database has a 50-character limit but naturally does not include specific manager name restrictions, so the schema you retrieve initially might look something like this:
<xsd:element minOccurs="0" name="Manager">
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:maxLength value="50"/>
</xsd:restriction>
</xsd:simpleType>
</xsd:element>
The control you generate from the initial schema will be formatted as a text control. You can make the control a dropdown by changing the control’s Display As property but you must add the actual restrictions to the schema itself, as shown below.
<xsd:element minOccurs="0" name="Manager" type="ManagerType"/>
<xsd:simpleType name="ManagerType">
<xsd:restriction base="xsd:string">
<xsd:enumeration value="John Doe"/>
<xsd:enumeration value="Pat Johnson"/>
<xsd:enumeration value="Mary Smith"/>
</xsd:restriction>
</xsd:simpleType>
You also can populate dropdown boxes dynamically from your database by writing a rule.
Adding Checkbox Options
You may also need a control to allow multi-select options. Like dropdown and radio controls described above, the control you generate from the initial schema will be formatted as a text control. You can make the control a checkbox by changing the control’s Display As property to Checkbox and changing the actual schema type to xsd:list as shown below:
<xsd:element minOccurs="0" name="colorChoice">
<xsd:simpleType>
<xsd:list itemType="xsd:string"/>
</xsd:simpleType>
</xsd:element>
Once the Color Choice control is formatted as a checkbox, a labels property will display in the properties settings tab for this control. Enter your checkbox options here.
Limitations
Currently, it is not possible to list the options directly in the schema or to have a checkbox option containing a space. So a label of "dark blue" will appear in the database as "dark_blue".
Dynamic Dropdown Options
Individual controls also may trigger SQL statements if you’ve customized your form with rules. See Dynamic Options Rule Examples for examples of using the ResultSet returned from the Database Connector to dynamically populate the options in a dropdown control.
It is not recommended to populate options on a from-schema selection control from a web service. If your business case requires this, make sure you do not have a restriction in the schema on the values/options.
Adding ComboBox or Message Controls from Schema
In order to add a Message or ComboBox control, you will need to edit your schema and add the appinfo attribute. Define the attribute by adding xmlns:frevvo="http://www.frevvo.com/appinfo" at the end of Line 2 in your schema. Here is an example.
<xsd:schema xmlns="http://www.frevvo.com/database/interns_forschema" xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.frevvo.com/database/interns_forschema">
<xsd:schema xmlns="http://www.frevvo.com/database/interns_forschema" xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.frevvo.com/database/interns_forschema"> xmlns:frevvo="http://www.frevvo.com/appinfo"
Then edit the element for the control you want to convert to a ComboBox as follows. The first line will already exist in your schema. You need to add the lines represented by lines #2-7 below.
Combobox
<xsd:element default="ComboBox" minOccurs="0" name="Department" type="xsd:string"> <xsd:annotation> <xsd:appinfo> <frevvo:displaytype>ComboBox</frevvo:displaytype> <frevvo:label>Department</frevvo:label> </xsd:appinfo> </xsd:annotation> </xsd:element>
Here is a screenshot of a schema before and after adding the annotation.
Message Control
Follow the same instructions as above but use this annotation:
<xsd:element default="Message" minOccurs="0" name="MessageControl" type="xsd:string">
<xsd:annotation>
<xsd:appinfo>
<frevvo:displaytype>Message</frevvo:displaytype>
<frevvo:label>Message Control</frevvo:label>
</xsd:appinfo>
</xsd:annotation>
</xsd:element>
Limiting potentially repeating Data
Often the schema from your database will allow any number of elements even though you know your form will never use more than one at a time. Every schema includes the “rows” element as shown in the partial schema below—note that based on the maxOccurs value of “unbounded” in the schema, there can be an unlimited number of customer elements.
<?xml version="1.0" encoding="ISO-8859-1"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns=http://www.frevvo.com/database/Customer
targetNamespace="http://www.frevvo.com/database/Customer">
<xsd:element name="Customers">
<xsd:complexType>
<xsd:sequence>
<xsd:element maxOccurs="unbounded" name="row">
<xsd:complexType>
<xsd:sequence
Since the schema says the element is unbounded, the control you generate initially will be a repeat control. You’ll see the the 
repeat icon in the Forms Designer and if you don’t make any changes, users will see the + sign that comes with repeat controls.
In this case, change the schema to indicate you only want to work with one customer at a time, as shown below.
<?xml version="1.0" encoding="ISO-8859-1"?>
<xsd:schema xmlns:xsd=http://www.w3.org/2001/XMLSchema xmlns=http://www.frevvo.com/database/Customer
targetNamespace="http://www.frevvo.com/database/Customer">
<xsd:element name="Customer">
<xsd:complexType>
<xsd:sequence>
<xsd:element maxOccurs="1" name="row">
<xsd:complexType>
<xsd:sequence>
Note that now maxOccurs="1" and that will force the + sign to disappear.
Type Restrictions
Sometimes the database field will let you enter any string such as a VarChar field. However if you field is a phone number you may which to have the form restrict the input to only valid phone numbers. See the section on patterns for more common type restrictions. In this example you still want the form input to be a text box. So we do not change the Format As.
Edit your xsd:
<xsd:element minOccurs="0" name="Home Phone">
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:maxLength value="12"/>
</xsd:restriction>
</xsd:simpleType>
</xsd:element>
Add the following simpleType restriction to your xsd.
<xsd:simpleType name="phoneType">
<xsd:restriction base="xsd:string">
<xsd:pattern value="\d{2}-\d{4}-\d{4}"/>
<xsd:pattern value="\d{4}-\d{3}-\d{3}"/>
</xsd:restriction>
</xsd:simpleType>
Finally change the existing type for the Home Phone element to:
<xsd:element minOccurs="0" name="Home Phone" type="phoneType"/>
Now the frevvo form will only accept valid phone numbers. If you enter an invalid phone the form will flag the field as invalid.
Display As
This property applies only to controls generated from XSD schema elements. If the control was dragged in from the palette, it has a Control Type property. Use the Display As property to change the way your control looks on your form when the control is imported from schema. For example, a text control can be changed to a dropdown or vice versa. Repeat and Table controls only have two options, Table and Repeat, in the Display As dropdown. A Repeat control can be changed to a table control and vice versa by selecting the appropriate option. Refer to the Control Type property for the details.
This will change the control's appearance but will not affect how the control validates data. If you need to modify the control's validation behavior, you must Updating a Schema.
To see the control's underlying data type and the global element to which it is bound, you can hover over the property tab. The expanded Data Source shown in the image below, displays the XSD path stated in the hover - the control named giftidea, is part of a complex type control named address, which is bound to the global element, addressBook. The underlying data type for the giftidea control, which was changed to display as a dropdown, will remain xs:string.
If you change the Display As value to one of the select control types: radio, dropdown or checkbox, a new property called Labels becomes visible. By adding strings into the labels property you can restrict the values allowed to be entered into this control when users use your form. When the form is submitted the value will be equivalent to the selected option label.
Another way to set the labels is via a rule to dynamically initialize the options when the form loads. See the Business Rules chapter for more details. Also see the section on dynamic initialization from database SQL queries.
The Display As property is not available for the following schema controls: Message, Date, Time, Date/Time, T/F, ComboBox.
Required Schema Controls
The required property is disabled for controls from XSD because validation is based on the XSD minOccurs value. If minOccurs="0" then the control is not required. If minOccurs="1" then the control is required. If minOccurs is greater than 1 then it will be rendered in the form as a repeat control with the minimum number of items set to the minOccurs value. A business rule can override the values in the XSD for the required property.
If your database column allows NULL then the XSD schema generated by the frevvo database connector will set minOccurs='0' for this control. When this control is used in your form the field will not be required. To make this field required you have to edit the XSD to set minOccurs='1' which makes the XSD schema more restrictive then your database schema.
To change the control's required status:
Write a business rule to make the field required.
Let's say a designer created a form from a schema that contained a non-required Text field - minOccurs = 0. The designer adds a Trigger control named tr1 and this simple rule to make the field required when the trigger control is clicked.
Here is the relevant section of the xsd:</xsd:element> <xsd:element minOccurs="0" name="NonRequiredControl" type="xsd:string"> <xsd:annotation> <xsd:appinfo> <frevvo:displaytype>Text</frevvo:displaytype> <frevvo:label>Non Required Control</frevvo:label> </xsd:appinfo> </xsd:annotation> </xsd:element>if(tr1.clicked){ NonRequiredControl.required = true; }Same Rule as above built with the Visual Rule Builder
- Edit the XSD and update it in the schema's tab for that project.
There are times when you have several fields that you want hidden and then only want to make visible depending on the value entered into another field. Thus only when the fields are visible do you want them to be required. Currently hidden required fields are still required and prevent the form from being submitted.
Imagine a form asking if a student speaks Spanish. If the answer is yes you want to make additional fields visible and required. But when the student doesn't speak Spanish the controls should remain hidden and not be required. Here is a solution for this use case:
For each control that needs to be required only when visible, edit the XSD and set minOccurs="1". The control must default to required in the XSD
- Drag/Drop a Section control from the frevvo palette into the form
- Uncheck the visible and required properties on the section control
- Drag all of the from XSD controls that need to be required only when visible into the section control
- Add a form.load rule that sets <section>.required=false. It is not enough to set the required checkbox in the section's properties panel. It must also be done in a form.load rule
- Add a 2nd rule that sets <section>.required=true when you make the fields visible, with an else clause to hide the fields that clears all values from those hidden controls AND sets <section>.required=false
Here is an example form.load rule where SpanishOnly is the name of the section control.
if (form.load) {
SpanishOnly.required = false;
}
Here is an example show/hide rule where name and age are required fields only for Spanish speaking students.
if (spanish.value == 'yes') {
SpanishOnly.required = true;
SpanishOnly.visible = true;
}
else {
// Must clear values in hidden fields
// Must be done BEFORE setting <section>.required=false
name.value = null;
age.value = null;
SpanishOnly.required = false;
SpanishOnly.visible = false;
}
Do NOT add required palette controls into an optional schema section. The from schema section tries to validate controls inside it as if they are inside an optional section, but because the controls are from palette they are not bound to the same schema. Validation will not work as expected. If these controls are needed, update the xsd to add the controls directly to the schema. Refer to Customizing the XMLSchema for examples of common xsd customizations.
Elements with a Nillable Attribute
frevvo fully supports nillable element attributes in schema. In previous versions, a required field (minOccurs = 1 or greater) in a form generated from schema, HAD to have a value for the form to be submitted. The control was considered required, ie. the control would display a yellow background color. Nillable attributes override the fact that the field is required and, if present and set to true, required controls will now be considered optional. When you submit a form and do NOT have a value in a minOccurs > 0 nillable field, the XML document generated by frevvo will contain an EMPTY element like this <control name xsi:nil="true"/>.
This is how it works for uploaded schemas:
- Elements that contain both nillable=true and minOccurs=0, will NOT be generated in the frevvo xml document.
- Elements that are required, minOccurs > 0, and nillable = true will be treated as an optional element. This means that the UI will generate an optional control for this element instead of a required one.
- When the value is not specified in use mode, frevvo will generate the element with xsi:nil=true. Ex: <control name xsi:nil="true"/>
Let's take a look at an example with Simple Repeating Elements in the schema:
<element name="simpleRepeatingNillables">
<complexType>
<sequence>
<element name="simpleR_nil_req1" type="string" nillable="true" minOccurs="1" maxOccurs="unbounded"></element>
<element name="simpleR_nil_req3" type="string" nillable="true" minOccurs="3" maxOccurs="unbounded"></element>
<element name="simpleR_nil_opt" type="string" nillable="true" minOccurs="0" maxOccurs="unbounded"></element>
<element name="simpleR_opt" type="string" minOccurs="0" maxOccurs="unbounded"></element>
<element name="simpleR_req1" type="string" minOccurs="1" maxOccurs="unbounded"></element>
<element name="simpleR_req3" type="string" minOccurs="3" maxOccurs="unbounded"></element>
</sequence>
</complexType>
</element>
The image below shows the form with data entered only in the fields that are required.
The XML document generated by frevvo when the form is submitted looks like this: Notice the xsi:nil="true" for all controls where minOccurs > 0 AND nillable=true and the user did not enter a value into the form.
<p0:simpleRepeatingNillables xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p0="http://www.example.org/nillables"> <simpleR_nil_req1 xsi:nil="true"/> <simpleR_nil_req3 xsi:nil="true"/> <simpleR_nil_req3 xsi:nil="true"/> <simpleR_nil_req3 xsi:nil="true"/> <simpleR_req1>value1</simpleR_req1> <simpleR_req3>value2</simpleR_req3> <simpleR_req3>value3</simpleR_req3> <simpleR_req3>value4</simpleR_req3> </p0:simpleRepeatingNillables>
Elements with Enumerations
If you add an element with enumerations from schema to your form, any dynamic options must conform to the schema. For example, you can create a dropdown from a schema that restricts values to say red, green, blue and in a rule set the options to Mr, Mrs, and Ms. In the form if you choose one of the values from the dropdown (Mr) you will get an Invalid value message since it's not part of the original schema.
Message Control in Repeat
To add a Message Control to your schema-based Repeat control, add an element like this to your schema:
<xsd:element default="Message" minOccurs="0" name="MessageControl" type="xsd:string"> <xsd:annotation> <xsd:appinfo> <frevvo:displaytype>Message</frevvo:displaytype> <frevvo:label>Message Control</frevvo:label> </xsd:appinfo> </xsd:annotation> </xsd:element>
Add this attribute in the <xsd:schema tag (it is most likely on line# 2 in the schema file):
xmlns:frevvo=http://www.frevvo.com/appinfo
Updating a Schema
If you need to make changes beyond those allowed in the Forms Designer, make the changes in your XSD file and replace the old schema in your frevvo project with the new one.
To update a schema:
- Click Schemas from the left-hand menu. (Remember, schemas are project-specific, so if you don’t see your schema, it may be in another project.)
- You’ll see a list of all uploaded schemas. Click the Action Menu and select
Update for the schema you are updating. - On the Update Schema page, click Browse and locate the new XSD file. You may change the schema name and description but this is optional. Remove the Root XSD file information if it does not apply.
- Click Update.
Note that you can also change the Name, Description and Root XSD File using Update Schema. For example if you only want to change the Name you set for this XSD then use this page to set a new name and click Update. This will only change the name and not the schema itself.
The Data Sources in your forms/workflows will not be refreshed automatically. Forms/Workflows will continue to use their original schema until the designer explicitly refreshes the Data Sources and, if necessary, modifies the form as described in the next section.
Forms and Workflows that are impacted by the schema update will have a gray error icon in the Form/Workflow's list. Compatibility will only be checked for the top-level elements (i.e. DocumentTypes) used in a form/workflow. If a top-level element is not used, then the form/workflow will not be incompatible.
Clicking that icon will display the message "One or more data sources outdated: <schema names>".
Refresh Data Sources
To refresh the data sources, edit the form/workflow. Then, in the upper right action menu select "Refresh Data Sources".
When schema update is done, any controls that are no longer valid to that schema are "detached" and fall into the default from scratch schema. frevvo marks them in error (yellow background) with the message "Control is unbound in form but in a from-schema repeat. You must remove this control." to give the designer a visual cue that some investigation is necessary. See Adjusting Your Form after Schema Updates.
If you do nothing and save the form at this point, you will set the form now highlighted in a salmon color in the list:
Also, users who attempt to use the form in this state will see the message "Error: This form is invalid and cannot be displayed. Please contact the form designer to correct the error."
Do not delete the updated elements from the Data Sources area unless you are absolutely sure no controls in your form were generated from the elements in the previous version of the schema. Also, do not delete the elements and try to re-add them. This will cause any controls that relied on the schema to become unbounded and moved out of the schema XML document into the form's default XML document.
If you do not specify a Name when you first upload your XSD it will default to the file name. However if you leave the Name blank in Update Schema it will retain the original name set when you uploaded the first time.
Update schema will fail if you change the 'global element name' of your schema. You will see this error:
This scenario is not supported by frevvo. Changing the global element name changes the schema and cannot be used to replace the previous schema.
Adjusting Your Form after Schema Updates
When you Refresh Data Sources your form is not necessarily up to date. You must edit your form, save it, and test it again to make sure the changes to the schema have produced the results you expected.
Depending on how you revised your schema, you may have to adjust the controls in your form. In most cases, you’ll need to delete the control from your form, and then re-generate a replacement control from the refreshed element in the Data Sources area. You’ll have to do this for the following schema changes:
- Changing the name of an element
- Changing an element’s type from a simple type to a complex type and vice versa.
- Moving a child element to a different parent
- Deleting an element
- Adding or removing data type restrictions
- Changing an element from non-repeating to repeating or vice versa
- Increasing maxOccurs from n to n+1 or more where n>0.
- Increasing minOccurs from 0 to 1.
For example, if you add restrictions to limit the possible values in a dropdown control, you will not see the new values until you delete the old control and generate a new one.
The list above is not exhaustive. Generally speaking, the more extensive your schema changes are, the higher the likelihood that you will have to delete the original controls and generate new ones. (Of course, if your schema has changed drastically, you may want to consider creating entirely new forms instead of trying to edit the old ones.)
Some minor schema changes frevvo handles automatically and does not require you to replace the control in the form. For example:
- If you change an element from one simple type to another (e.g., a string to an integer), the corresponding control will change validation accordingly
- If you make an un-required element required by changing the minOccurs from 0 to 1, the corresponding control automatically will be required and marked with a yellow background color—and vice versa if you change the minOccurs from 1 to 0.
The Forms Designer alerts you to any controls for which the schema elements were deleted by displaying them with (placeholder: a brown border) after you have updated your schema. However, deleted elements are not the only reason a control can become unbounded from its corresponding schema element. Elements you update to make repeating are a good example—the “old” controls in your form will not be automatically updated to be a repeat control. You must delete the old control and generate a new one by clicking the icon next to the element name in the Data Sources area.
For example, Let's say you create a form and a workflow that uses that form as a step from an Address Book schema. The form created from this schema contains Title, Last Name, Address2, Zip code, Home Phone, and Gift Idea fields among others. You make these updates to the schema and then update it as described above.
- Changed the minOccurs value for the Title field to 1 making it required.
- Deleted the Last Name field from the schema
- Moved the Home Phone field into the Address section and removed the Zip Code field from the Address section
- Added a Number of Members in Family field to the schema.
When you edit the form/workflow step, after updating the schema, warnings and instructions will show for any controls that have become unbound etc. Notice the Number of Members in Family field has been added to the Data Source and now can be added to the form/workflow.
Although we do not recommend leaving unbounded controls in your form, you are not explicitly prevented from doing so. If you save your form with unbounded controls, data submitted in these controls will be included in the default XML Submission document for the form itself as opposed to being captured in the XML document for the schema.
Repeating Elements
One exception is repeating elements. If you edit your schema and delete elements from within a repeating complex type, frevvo will automatically remove those deleted elements from your form. This is because a from schema repeating complex type is not allowed to contain any controls from the palette. Once the deleted elements automatically become unbound from the schema frevvo automatically deletes them from the form.
Also, repeating elements added to the form from the Data Source are automatically added into the associated repeat control(s) if any already exist on your form. While all non-repeating controls are simply added to the top of the form when added from the Data Source.
Searching submissions using a Repeat control from Data Sources is not supported.
Deleting Unused Data Source Elements
You do not have to generate a control from every element in the Data Sources area. The Submissions Data tab will show labels only for the controls on your form, and the Submissions XML document will capture only those data elements that users actually entered on your form.
However, keep in mind that a separate XML document is created for each global element you've added to your form, so if you don't need a global element, delete it from the form's Data Sources. Do this by clicking the 
icon next to the element's name. As the illustration below shows, you cannot delete child elements of a global element; you must delete the entire parent. If you have created controls for any child element, do not delete the global (parent) element.
Deleting a Schema
If you upload a schema you do not need, you can delete it. Choose Schemas from the left-hand menu and click the icon next to the name of the schema you wish to delete. (If you are working in the Forms Designer, you must finish or cancel your form to access frevvo's left-hand menu.)
If you choose to do this, be certain that none of your forms rely on elements from this schema. Any forms that use elements from the deleted elements will be adversely affected, so frevvo will prevent you from deleting any schemas that are currently in use. You will see this message that list all the forms/workflows that are using the schema.
If you still need to delete the schema, edit each form/workflow listed in the warning message and remove it from the form/workflow data source. Then go back to the Schemas tab and delete the schema.
If you leave unused data sources in your form they are still part of your form's document even if you have removed all associated controls from the form designer canvas. You will see that xml documents are created for these unused schemas in form submissions and are visible in the doc action manually set doc Uris. If you do not want them there then delete them from the data source panel.
Download a Schema
To download a schema choose Schemas from the left-hand menu and click the 
icon. This will download the schema(s) in a zipfile. Even if the schema was uploaded into the project as a single XSD file, it will be downloaded as a single XSD but will be in a zipfile.
Common Schema Errors
Schema validation error messages are long and complex. Some common schema validation errors have been translated into messages that give the user a hint about why the value is invalid. You may see these errors if you enter a value does not match a required pattern, a value exceeds the maximum length or is less than the minimum length specified in the schema.
Unsupported Types
Schemas with Repeating Model Groups are not yet supported. While repeating elements are supported, xsd constructs like the following currently are not. Do not use elements with repeating model groups in your forms.
<sequence minOccurs="2" maxOccurs="3"/>
Schemas Choice Groups are not yet supported. The 1st choice appear on the form as required even though only one is. Do not use elements of type Choice in your forms.
<xs:element name="promotion">
<complexType>
<choice>
<element name="Discount" />
<element name="None" />
</choice>
</complexType>
</xs:element>
Schemas with Mixed Content are not yet supported.
<xs:element name="letter">
<xs:complexType mixed="true">
<xs:sequence>
<xs:element name="name" type="xs:string"/>
<xs:element name="orderid" type="xs:positiveInteger"/>
<xs:element name="shipdate" type="xs:date"/>
</xs:sequence>
<xs:attribute name="type" type="xsd:string"/>
</xs:complexType>
</xs:element>
If you are able to edit the schema, extract the text into new child elements.
Initialization from XML
Schema controls can be initialized from an xml document using the form's doc action and manually set document URIs. See the integration chapter with details on initializing Forms with XML Documents.